3 ms·
> use low-frequency PWM to regulate down high system voltages to 12V That can't be right. Cars are primarily 12VDC.
by p1mrx 4y ago
> use low-frequency PWM to regulate down high system voltages to 12V
That can't be right. Cars are primarily 12VDC.
- jeffbee 4y agoSystem voltage when the engine is running are higher otherwise the 12V battery would never charge. Can be as high as 18V. So cars with halogen lights with just chop it down to 12V. Here's a random video I found demonstrating the phenomenon. https://www.youtube.com/watch?v=82tFav8oGFI https://www.youtube.com/watch?v=82tFav8oGFI
- p1mrx 4y agoInteresting, so they're using PWM to hold the headlights at constant brightness when the alternator runs. Wiring a capacitor in parallel with the headlights should fix that.